Multiple choice

Ramesh is thrice as efficient as Suresh and hence completes a work in 40 days less than the number of days taken by Suresh. What will be the number of days taken by both of them when working together? / रमेश, सुरेश से तीन गुना कार्यकुशल है अतः एक कार्य को पूरा करने में सुरेश द्वारा लिये गये दिनों की संख्या से 40 दिन कम लेता है। दोनों के द्वारा लिये गये दिनों की संख्या क्या होगी जब वे एक साथ कार्य करते हैं-

  1. 22.5 days

  2. 15 days

  3. 20 days

  4. 18 days

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ramesh takes 20 days to complete the work alone, while Suresh takes 60 days (Ramesh is 3 times as efficient and finishes 40 days faster). When working together, their combined rate is 1/20 + 1/60 = 4/60 = 1/15 of the work per day. Therefore, they complete the entire work in 15 days when collaborating.